* Give .props files 2-space indents.
* Move to Central Package Management.
Allows us to store NuGet package versions all in one place. Yay!
* Update NuGet packages and fix code for changes.
Notable:
Changes to ILVerify.
Npgsql doesn't need hacks for inet anymore, now we need hacks to make the old code work with this new reality.
NUnit's analyzers are already complaining and I didn't even update it to 4.x yet.
TerraFX changed to GetLastSystemError so error handling had to be changed.
Buncha APIs have more NRT annotations.
* Remove dotnet-eng NuGet package source.
I genuinely don't know what this was for, and Central Package Management starts throwing warnings about it, so YEET.
* Remove Robust.Physics project.
Never used.
* Remove erroneous NVorbis reference.
Should be VorbisPizza and otherwise wasn't used.
* Sandbox fixes
* Remove unused unit test package references.
Castle.Core and NUnit.ConsoleRunner.
* Update NUnit to 4.0.1
This requires replacing all the old assertion methods because they removed them 🥲
* Oh so that's what dotnet-eng was used for. Yeah ok that makes sense.
* Add Robust.Analyzers.Test
* Update submodule
* commit to re-run CI
(cherry picked from commit a6c9c36b688a1ba78ff4c12502e81661cf607b6c)
